Hi, AND1007, change filters and check, comment result, these capacitors if they are bad, the TRs, are heated, by poorly filtered current.
Look at this link, you may be out of doubt.
https://www.yoreparo.com/es/tv/televisores/lcd/led/preguntas/6231218/capacimetros-y-multimetro-para-medir-el-esr-por-kastell
but because if it does not vary much for example the hfe of the a940 is: 40 and that of tip42c is: 20 for 20menos not work? I have already replaced other transistors in other equipment and well but never in an audio amplifier and I thought it would work because the tip42c is an audip that the other amplifiers use
friend but I want to clarify doubts because it is difficult to get those transistors the people who have them are very expensive so I ask the question
because if a d1047 transistor of power is 100w and the profit is hfe: it is 60 because the sellers of electronic spare parts replace it with a d718 transistor of 80w and the gain is 55 and it works without roll?